Grand Haven, MI 49460 Frost Dates
When can you plant in Grand Haven, MI?
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/24, about 175 frost-free days later.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Grand Haven, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Grand Haven before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grand Haven compares
Grand Haven's growing season runs about 175 days, ranking 26,801 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 140 of 1,153.
Learn more
local microclimates covers what one yard in Grand Haven can differ from the 49460 normal. zone vs. frost date covers why Zone 6b and Grand Haven's frost date answer different questions.